Chandra X-Ray Detection of the Radio HotSpots of 3C 295

D. E. Harris; P. E. J. Nulsen; T. J. Ponman; M. Bautz; R. A. Cameron; L. P. David; R. H. Donnelly; W. R. Forman; L. Grego; M. J. Hardcastle; J. P. Henry; C. Jones; J. P. Leahy; M. Markevitch; A. R. Martel; B. R. McNamara; P. Mazzotta; W. Tucker; S. N. Virani; J. Vrtilek

doi:10.1086/312503

Chandra X-Ray Detection of the Radio Hot Spots of 3C 295

D. E. Harris¹, P. E. J. Nulsen^1,2, T. J. Ponman^1,3, M. Bautz⁴, R. A. Cameron¹, L. P. David¹, R. H. Donnelly¹, W. R. Forman¹, L. Grego¹, M. J. Hardcastle⁵, J. P. Henry⁶, C. Jones¹, J. P. Leahy⁷, M. Markevitch¹, A. R. Martel⁸, B. R. McNamara¹, P. Mazzotta¹, W. Tucker¹, S. N. Virani¹, and J. Vrtilek¹

Published 2000 January 25 • © 2000. The American Astronomical Society. All rights reserved. Printed in U.S.A.
The Astrophysical Journal, Volume 530, Number 2 Citation D. E. Harris et al 2000 ApJ 530 L81 DOI 10.1086/312503

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¹ Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138

² Department of Engineering Physics, University of Wollongong, Wollongong, NSW 2522, Australia

³ School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, England, UK

⁴ Massachusetts Institute of Technology, Center for Space Research, 70 Vassar Street, Building 37, Cambridge, MA 02139

⁵ Department of Physics, University of Bristol, Royal Fort, Tyndall Avenue, Bristol, BS8 1TL, England, UK

⁶ Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822

⁷ University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire, SK11 9DL, England, UK

⁸ Department of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218

Dates

Received 1999 November 18
Accepted 1999 December 22
Published 2000 January 25

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Abstract

An observation of the radio galaxy 3C 295 during the calibration phase of the Chandra X-Ray Observatory reveals X-ray emission from the core of the galaxy, from each of the two prominent radio hot spots, and from the previously known cluster gas. We discuss the possible emission processes for the hot spots and argue that a synchrotron self-Compton (SSC) model is preferred for most or all of the observed X-ray emission. SSC models with near-equipartition fields thus explain the X-ray emission from the hot spots in the two highest surface brightness FR II radio galaxies, Cygnus A and 3C 295. This lends weight to the assumption of equipartition and suggests that relativistic protons do not dominate the particle energy density.

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